With ETTR you are overexposing though. Sure the data is there but if you shot the photo JPEG or even just did a direct transfer from RAW to JPEG on the photo it would be overexposed.

Sovern, this one remark seems to show you do not have a real grasp of digital workflow or the science of digital photography.

There is absolutely no such thing nor can there be such a thing as direct transfer. JPegs from the camera are not in anyway a pure output of a camera.

All digital caputres start as RAW red, green and blue dots and go through a demosaicing process based on software to become an image type. How it does that is editable. If you decide to not edit this and accept the default edits in the camera, it is not a direct transfer. It just means you've choses not to change the edits from whatever they were. The camera company's defaults start you off with a guess based on what they think might be some average scene.

If your camera is still set at default or if you don't change those edits per image, you're missing half of what photography has to offer. Not understanding this and not grasping this is something that you might want to do before attempting to teach new photographers.